Detection of gravitational waves (GW) from coalescence of numerous compact binaries by LIGO [1]} and Virgo [2]} has opened up a new era of astronomy [3]}, [4]}. Their observations have motivated a series of tests of General Relativity (GR) [5]}, [6]}. The components of the binaries observed by LIGO and Virgo are mainly inferred to be either black holes (BH) or neutron stars (NS), which is primarily based on the measurements of component masses, population models, and tidal deformability of neutron stars [7]}.
Merger of
NSs was
observed in the events GW170817 [8]} and GW190425 [9]}. More recently, confirmed detections of events GW200105 and GW200115 [10]} were made where one of the components is believed to be a BH, and the other an NS. However, for the heavier LIGO-Virgo binaries [3]}, it remains to be conclusively proven whether their components are, in fact, BHs of GR or not.
